I also wrote down a variation using Plantation Three Star (my new go-to white rum) which turned out nicely.

*Lightly muddle 1 cup of fresh cranberries in a large mason jar, then add 1/2 cup each of apple cider vinegar and white wine vinegar. Let this infuse in the refrigerator for a week, shaking every other day, then add 1 1/2 cups raw sugar. Let this infuse for another week, shaking daily, then fine-strain into a clean container. Add about 1/2 oz 100-proof (or higher) neutral grain spirit and keep refrigerated.